**1.首先查看官方文档查看url和请求参数，返回参数** https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_3 **2.需要的前置条件** ![image.png](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8111bf9aae4a497cbb0a589e4c47531e~tplv-k3u1fbpfcp-watermark.image) 需要做的准备工作 1.下载API证书商户平台->账号中心->API安全下载API证书 ![image.png](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/676c92b46a7644409d27fa048d17051c~tplv-k3u1fbpfcp-watermark.image) 查看配置使用说明 ![image.png](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/90d96bc8730644659d2ffc5e16808c61~tplv-k3u1fbpfcp-watermark.image) 里面有什么语言使用什么证书，以及证书怎么使用的 2.充值 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/83b2bdbe65f548d5b876fc21174def66~tplv-k3u1fbpfcp-watermark.image) 3.获取openid 目前支持向指定微信用户的openid发放指定金额红包。（获取openid参见微信公众平台开发者文档：[网页授权获取用户基本信息](https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html)） 4.相关参数设置和红包相关的参数，你可以在页面上自主设置和更改。操作路径如下：【登录商户平台——>产品中心——>现金红包——>产品设置】（注：“产品设置”操作按钮仅当你开通现金红包功能之后才会出现）。还可以对额度及安全等参数进行设置;(**特别注意：调用IP地址设置**) ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3cb21f07e8b94020a0064a2e5dce1131~tplv-k3u1fbpfcp-watermark.image) **3.具体实现** 1.在application.properties中配置所需要的参数 ![image.png](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/6ac71c087f974f968e4f9ac4a5d76104~tplv-k3u1fbpfcp-watermark.image) 2.从配置文件获取参数及配置其他参数 *WxAuthorization* ```` import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class WxAuthorization { /** * 微信公众号的AppId */ @Value("${wechat.appId}") public String WX_APP_ID; /** * 应用授权作用域 */ @Value("${wechat.scope}") public String SCOPE; /** * 公众号的appSecret */ @Value("${wechat.secret}") public String SECRET; /** * 微信支付分配的商户号 */ @Value("${wechat.mchId}") public String MCH_ID; /** * 商户名称 */ @Value("商户名称") public String SEND_NAME; /** * 付款金额 */ @Value("${wechat.totalAmount}") public String TOTAL_AMOUNT; /** * 红包发放总人数 */ @Value("${wechat.totalNum}") public int TOTAL_NUM; /** * 红包祝福语 */ @Value("感谢您的参与") public String WISHING; /** * Ip地址 */ @Value("${wechat.clientIp}") public String CLIENT_IP; /** * 活动名称 */ @Value("活动名称") public String ACT_NAME; /** * 备注 */ @Value("备注") public String REMARK; /** * 微信商户证书路径 */ @Value("${wechat.certPath}") public String CERT_PATH; /** * 商户平台设置的密钥key */ @Value("${wechat.key}") public String KEY; /** * 商户平台设置的密钥key */ @Value("${wechat.url}") public String URL; } ```` 3.主文件*WxAuthorizedLogin* 底下是主文件下的几个方法 openId通过授权获取的 ```` /** * 现金红包 * @Title: bindDevice * @return String * @throws */ public Map sendRedPackUrl(String openId) { SendRedPack sendRedPackOrderSign = createSendRedPackOrderSign(openId); String xml = getXml(sendRedPackOrderSign); log.info(xml); String response = ssl(xml); Map responseMap = new HashMap<>(); try { responseMap = xmlUtil.parseXml(response); } catch (Exception e) { log.error(e.toString()); } return responseMap; } ```` ```` /** * 证书使用及调红包接口发红包返回数据 * @param data * @return */ private String ssl(String data){ StringBuffer message = new StringBuffer(); try { KeyStore keyStore = KeyStore.getInstance("PKCS12"); FileInputStream fileInputStream = new FileInputStream(new File(wxAuthorization.CERT_PATH)); keyStore.load(fileInputStream, wxAuthorization.MCH_ID.toCharArray()); // Trust own CA and all self-signed certs SSLContext sslcontext = SSLContexts.custom() .loadKeyMaterial(keyStore, wxAuthorization.MCH_ID.toCharArray()) .build(); // Allow TLSv1 protocol only SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory( sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.getDefaultHostnameVerifier()); CloseableHttpClient httpclient = HttpClients.custom() .setSSLSocketFactory(sslConnectionSocketFactory) .build(); HttpPost httpPost = new HttpPost(wxAuthorization.URL); httpPost.addHeader("Connection", "keep-alive"); httpPost.addHeader("Accept", "*/*"); httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); httpPost.addHeader("Host", "api.mch.weixin.qq.com"); httpPost.addHeader("X-Requested-With", "XMLHttpRequest"); httpPost.addHeader("Cache-Control", "max-age=0"); httpPost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) "); httpPost.setEntity(new StringEntity(data, "UTF-8")); log.info("executing request" + httpPost.getRequestLine()); CloseableHttpResponse response = httpclient.execute(httpPost); try { HttpEntity entity = response.getEntity(); log.info("" + response.getStatusLine()); if (entity != null) { log.info("Response content length: " + entity.getContentLength()); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent(),"UTF-8")); String text; while ((text = bufferedReader.readLine()) != null) { message.append(text); } } EntityUtils.consume(entity); } catch (IOException e) { e.printStackTrace(); } finally { response.close(); } } catch (Exception e1) { e1.printStackTrace(); } log.info(message.toString()); return message.toString(); } ```` ```` /** * 随机字符串生成 * @return */ private static String getNonce_str() { String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random random = new Random(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < 32; i++ ) { int number = random.nextInt(base.length()); sb.append(base.charAt(number)); } return sb.toString(); } ```` ```` /** * 随机获取某一设置的红包金额 * @param totalAmount * @return */ private int getAmount(String totalAmount) { String[] amounts = totalAmount.split(","); String amount = amounts[(int)(Math.random() * amounts.length)]; return Integer.parseInt(amount); } ```` ```` /** * 签名生成和红包参数model封装 * @param openId * @return */ private SendRedPack createSendRedPackOrderSign(String openId){ SendRedPack sendRedPack = SendRedPack.builder() .act_name(wxAuthorization.ACT_NAME) .client_ip(wxAuthorization.CLIENT_IP) .mch_billno(wxAuthorization.MCH_ID + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + (int)((Math.random() * 9 + 1) * 1000)) .mch_id(wxAuthorization.MCH_ID) .nonce_str(getNonce_str()) .re_openid(openId) .remark(wxAuthorization.REMARK) .send_name(wxAuthorization.SEND_NAME) .total_amount(getAmount(wxAuthorization.TOTAL_AMOUNT)) .total_num(wxAuthorization.TOTAL_NUM) .wishing(wxAuthorization.WISHING) .wxappid(wxAuthorization.WX_APP_ID) .build(); StringBuffer sign = new StringBuffer(); sign.append("act_name=").append(sendRedPack.getAct_name()); sign.append("&client_ip=").append(sendRedPack.getClient_ip()); sign.append("&mch_billno=").append(sendRedPack.getMch_billno()); sign.append("&mch_id=").append(sendRedPack.getMch_id()); sign.append("&nonce_str=").append(sendRedPack.getNonce_str()); sign.append("&re_openid=").append(sendRedPack.getRe_openid()); sign.append("&remark=").append(sendRedPack.getRemark()); sign.append("&send_name=").append(sendRedPack.getSend_name()); sign.append("&total_amount=").append(sendRedPack.getTotal_amount()); sign.append("&total_num=").append(sendRedPack.getTotal_num()); sign.append("&wishing=").append(sendRedPack.getWishing()); sign.append("&wxappid=").append(sendRedPack.getWxappid()); sign.append("&key=").append(wxAuthorization.KEY); String s = DigestUtils.md5Hex(sign.toString()).toUpperCase(); sendRedPack.setSign(s); return sendRedPack; } ```` ```` /** * 红包功能接口参数xml封装 * @param sendRedPack * @return */ public String getXml(SendRedPack sendRedPack) { StringBuilder reqXmlStr = new StringBuilder(); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); reqXmlStr.append(""); return reqXmlStr.toString(); } ```` 在提供两个我写的授权方法（code是通过前端传入的） ```` /** * 通过code获取微信用户基本信息(授权) * @param code * @return * @throws IOException */ public Result getWxUser(String code) { String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + wxAuthorization.WX_APP_ID + "&secret=" + wxAuthorization.SECRET + "&code=" + code + "&grant_type=authorization_code"; String s = doGet(url); int index = s.indexOf("access_token"); if(index == -1) { log.info("此code已经被使用"); return Result.error("此code已经被使用"); } WxAccessToken token = JSON.parseObject(s, WxAccessToken.class); String refreshUrl = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + wxAuthorization.WX_APP_ID + "&grant_type=refresh_token&refresh_token=" + token.getRefreshToken(); String s1 = doGet(refreshUrl); WxAccessToken token1 = JSON.parseObject(s1, WxAccessToken.class); String userUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" + token1.getAccessToken() + "&openid=" + token1.getOpenId() + "&lang=zh_CN"; String s2 = doGet(userUrl); log.info("微信返回参数："+s2); index = s2.indexOf("nickname"); if(index == -1) { log.info("AppID无效"); return Result.error("AppID无效"); } WxUser wxUser = JSON.parseObject(s2, WxUser.class); return Result.ok(wxUser); } ```` ```` /** * 通过code获取微信用户openid(静默授权) * @param code * @return */ public Result getOpenId(String code) { String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + wxAuthorization.WX_APP_ID + "&secret=" + wxAuthorization.SECRET + "&code=" + code + "&grant_type=authorization_code "; String s = doGet(url); int index = s.indexOf("access_token"); if(index == -1) { return Result.error("此code已经被使用"); } WxAccessToken token = JSON.parseObject(s, WxAccessToken.class); return Result.ok(token.getOpenId()); } ```` 最后，还有一个xml的工具类*XmlUtil* ```` import com.thoughtworks.xstream.XStream; import com.thoughtworks.xstream.core.util.QuickWriter; import com.thoughtworks.xstream.io.HierarchicalStreamWriter; import com.thoughtworks.xstream.io.naming.NoNameCoder; import com.thoughtworks.xstream.io.xml.DomDriver; import com.thoughtworks.xstream.io.xml.PrettyPrintWriter; import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder; import com.thoughtworks.xstream.io.xml.XppDriver; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.springframework.stereotype.Component; import java.io.Writer; import java.util.HashMap; import java.util.List; import java.util.Map; /** * 解析XML工具类 * @author zengliang */ @Component public class XmlUtil { /** * 解析微信返回的XML * @param xml * @return * @throws Exception */ @SuppressWarnings("unchecked") public Map parseXml(String xml)throws Exception { Map map = new HashMap(); Document doc = null; try { doc = DocumentHelper.parseText(xml); // 将字符串转为XML Element rootElt = doc.getRootElement(); // 获取根节点 List list = rootElt.elements();//获取根节点下所有节点 for (Element element : list) { //遍历节点 map.put(element.getName(), element.getText()); //节点的name为map的key，text为map的value } } catch (DocumentException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return map; } /** * 扩展xstream，使其支持CDATA块 */ private XStream xstream = new XStream(new XppDriver(new NoNameCoder()) { @Override public HierarchicalStreamWriter createWriter(Writer out) { return new PrettyPrintWriter(out) { // 对所有xml节点的转换都增加CDATA标记 boolean cdata = true; @Override @SuppressWarnings("rawtypes") public void startNode(String name, Class clazz) { super.startNode(name, clazz); } @Override public String encodeNode(String name) { return name; } @Override protected void writeText(QuickWriter writer, String text) { if (cdata) { writer.write(""); } else { writer.write(text); } } }; } }); private XStream inclueUnderlineXstream = new XStream(new DomDriver(null,new XmlFriendlyNameCoder("_-", "_"))); public XStream getXstreamInclueUnderline() { return inclueUnderlineXstream; } public XStream xstream() { return xstream; } } ```` 发送红包功能就全部结束了，调用sendRedPackUrl方法即可发送红包